There are other food will cause phlegm, not necessary only fruits.
The main food allergens include eggs, fish, milk, tree nuts, peanuts, shellfish and soybeans. Other foods could also produce an allergic reaction and thus an increase in mucus. http://www.livestrong.com/article/339269-foods-that-create-mucus/
There are food that can be consumed to reduce phlegm:
http://www.whyamiunhealthy.com/8-foods-that-reduce-mucus-phlegm-and-snot/